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It was the wings I was most concerned with. The carbon fiber, the glassing, the dowels and the measurements. Most of the components seemed fairly good; of most concern was the rear drag spar which happend to have been off the prescribed 90 degrees by far too much. But by careful shimming I managed to position the aluminum attachment plate in the correct position. |
The wings without fittings were constructed by the previous builder with the aid of the local Eaa chapter and besides the not too perfect form it seemed structurally fine. I would have spent a lot less time finish sanding the wings if the builder had spent more time smoothing the foam before glassing. One error that disturbed me was the use of masking tape to cover some of the joints in the foamon the tail section. This causes delamination later and I have spent some time removing the masking tape from the elevator
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Fitting the aluminum fittings at the wing root was quite difficult. It requires very close tolerance work with a drill press. Fitting theses pieces requires that the main spar was done accurately when the carbon fiber was laid up. Mine came partially done so I had the work with the small errors of the original builder, all of which where easily covered. The wings must be set up with the full span,with careful measuring every step of the way. Most frustrating was the dihedral setting. With such a span setting that dihedral is difficult. Picking up the wing tip produces a noticeable droop in the wing. Also just knowing where level was, was difficult. Luckily my floor was level so I set the wings up so they measured a slight dihedral. It was really just a calculated guess, Ill find out just how successful it was on our first ground skim. Correcting dihedral at this point after the fact will be difficult. Remember that a high wing has already an effective dihedral when flat. |
Drilling the fuselage at the rear spar attachment had some problems too. It was impossible to use a drill press so some eye work had to be done. For the most part I succeeded but a few holes where a little off center. In future I will start a small size pilot hole then work my way up to the full size, an oversight that I will correct in the next project. I have had to remake parts, but better now than having to live with something I dislike later. I have since learnt of an easy way to align holes.
Making the Ailerons was quite a chore. It took for ever to line up and put those hinges on. I used a string line to get the same hinge line on the wing and mated as best I could to the aileron. At one point epoxy flowed into the hinge which caused no end of difficulty to free up the hinge and remove the pin. I have had to remove the pin and work on the airleron many times during the wing sanding process.
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Jan 99,Well a time of truth.... the wings are removed form the fuselage and then set up for proof loading. My shop is on the third floor and that meant a lot of trips for the sand! I went to 4 g's and everything held well! So on to completion. |
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The sand bags where weighed carefully and put on the wing. The test to 4 g's worked just fine! |
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I lowered the wing with the use of pulleys.... and it was still very heavy! |